/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.dbw.test;

import java.io.File;
import java.io.IOException;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.interactive.action.PDAction;
import org.apache.pdfbox.pdmodel.interactive.action.PDActionGoTo;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.destination.PDDestination;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDDocumentOutline;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDOutlineItem;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDOutlineNode;

/**
 * This is an example on how to access the bookmarks that are part of a pdf document.
 *
 * @author Ben Litchfield
 * 
 */
public class PrintBookmarks
{
    /**
     * This will print the documents data.
     *
     * @param args The command line arguments.
     *
     * @throws IOException If there is an error parsing the document.
     */
    public static void main( String[] args ) throws IOException
    {
        if( args.length != 1 )
        {
            usage();
        }
        else
        {
            PDDocument document = null;
            try
            {
                document = PDDocument.load( new File(args[0]) );
                PrintBookmarks meta = new PrintBookmarks();
                PDDocumentOutline outline =  document.getDocumentCatalog().getDocumentOutline();
                if( outline != null )
                {
                    meta.printBookmark( outline, "" );
                }
                else
                {
                    System.out.println( "This document does not contain any bookmarks" );
                }
            }
            finally
            {
                if( document != null )
                {
                    document.close();
                }
            }
        }
    }

    /**
     * This will print the usage for this document.
     */
    private static void usage()
    {
        System.err.println( "Usage: java " + PrintBookmarks.class.getName() + " <input-pdf>" );
    }

    /**
     * This will print the documents bookmarks to System.out.
     *
     * @param bookmark The bookmark to print out.
     * @param indentation A pretty printing parameter
     *
     * @throws IOException If there is an error getting the page count.
     */
    public void printBookmark( PDOutlineNode bookmark, String indentation ) throws IOException
    {
        PDOutlineItem current = bookmark.getFirstChild();
        
        while( current != null )
        {
//            System.out.println( indentation + current.getTitle() );
        	System.out.printf("%s (%s) %s\n", indentation, 
        	        getDestination(current),
        			current.getTitle());
            printBookmark( current, indentation + "|__ " );
            current = current.getNextSibling();
        }

    }
    
    private static PDDestination getDestination(PDOutlineItem outlineItem) throws IOException {
        PDDestination dest = null;
        
        dest = outlineItem.getDestination();
        if(dest != null) {
            return dest;
        }
        
        PDAction pdAction = outlineItem.getAction();
        if(pdAction != null && pdAction instanceof PDActionGoTo) {
            dest = ((PDActionGoTo)pdAction).getDestination();
        }
        
        return dest;
    }
}
